Science 10 with CSS teacher

Decomposition reactions are the opposite of synthesis reactions. Definition:A decomposition reaction is when compounds breaks down into two or more products (often elements).

• AB --> A + B where A and B represent elements

Ionic compounds may decompose to produce elements, like this:

• Table salt, sodium chloride, can be broken down into sodium metal and chlorine gas by melting salt at 800ºC and running electricity through it.

Covalent compounds may decompose into elements, like this:

• By running electricity through water, the water molecules decompose into hydrogen and oxygen gases.

Watch this video on decomposition reactions.